Perylene nanocrystals with different sizes(10-250 nm) were prepared by reprecipitation. Compared with the absorption spectrum of perylene acetone solution, a new J aggregate absorption peak appeared in the absorption ...Perylene nanocrystals with different sizes(10-250 nm) were prepared by reprecipitation. Compared with the absorption spectrum of perylene acetone solution, a new J aggregate absorption peak appeared in the absorption spectra of nanocrystals. With the decrease of perylene nanocrystals size, it shows a blue shift in the absorption spectra. This blue shift is due to the size dependent property. The perylene concentration of initial acetone solution or the amount of solution injected into water, the aging time of organic nanocrystal dispersion and the adding of surfactant were the influencing factors of nanocrystal growth. We can gain the required microcrystals of different sizes by controlling the conditions of growth.展开更多
Poly(TMPD)/MoO3 was constructed via a cooperative formation route from TMPD and molybdate ammonium at acidified conditions.XRD data showed a layered structure along c axis.IR and Raman spectra confirmed that TMPD had ...Poly(TMPD)/MoO3 was constructed via a cooperative formation route from TMPD and molybdate ammonium at acidified conditions.XRD data showed a layered structure along c axis.IR and Raman spectra confirmed that TMPD had been polymerized and intercalated into MoO3 layers.TGA curve gave the composition of [poly(TMPD)]0.23MoO3(H2O)0.31.Meanwhile,it was found that MoO3 accelerated the polymerization process of TMPD by entrapping the polymer and disturbing the balance between monomer and polymer with deposition of Poly(TMPD)/MoO3.According to this mechanism,a design for constructing layered polymer/MoO3 was proposed and a scheme was drawn also.展开更多
Perylene nanoparticles with different sizes were prepared by reprecipitationmethod. It is found that the nanoparticles show size-dependent optical property. Electrondiffraction patterns indicate that all the nanoparti...Perylene nanoparticles with different sizes were prepared by reprecipitationmethod. It is found that the nanoparticles show size-dependent optical property. Electrondiffraction patterns indicate that all the nanoparticles of different sizes are in crystallinestate. The rapid growth of the nanoparticles during the aging process could be slowed downeffectively by the addition of cationic or anionic surfactants.展开更多
文摘Perylene nanocrystals with different sizes(10-250 nm) were prepared by reprecipitation. Compared with the absorption spectrum of perylene acetone solution, a new J aggregate absorption peak appeared in the absorption spectra of nanocrystals. With the decrease of perylene nanocrystals size, it shows a blue shift in the absorption spectra. This blue shift is due to the size dependent property. The perylene concentration of initial acetone solution or the amount of solution injected into water, the aging time of organic nanocrystal dispersion and the adding of surfactant were the influencing factors of nanocrystal growth. We can gain the required microcrystals of different sizes by controlling the conditions of growth.
文摘Poly(TMPD)/MoO3 was constructed via a cooperative formation route from TMPD and molybdate ammonium at acidified conditions.XRD data showed a layered structure along c axis.IR and Raman spectra confirmed that TMPD had been polymerized and intercalated into MoO3 layers.TGA curve gave the composition of [poly(TMPD)]0.23MoO3(H2O)0.31.Meanwhile,it was found that MoO3 accelerated the polymerization process of TMPD by entrapping the polymer and disturbing the balance between monomer and polymer with deposition of Poly(TMPD)/MoO3.According to this mechanism,a design for constructing layered polymer/MoO3 was proposed and a scheme was drawn also.
文摘Perylene nanoparticles with different sizes were prepared by reprecipitationmethod. It is found that the nanoparticles show size-dependent optical property. Electrondiffraction patterns indicate that all the nanoparticles of different sizes are in crystallinestate. The rapid growth of the nanoparticles during the aging process could be slowed downeffectively by the addition of cationic or anionic surfactants.
